# defines:
#
# NM
# OBJCOPY
# LD
# CXX_COMPILER
# C_COMPILER
# CMAKE_SYSTEM_NAME
# CMAKE_SYSTEM_VERSION
# LINKER_FLAGS
# CMAKE_EXE_LINKER_FLAGS
# CMAKE_FIND_ROOT_PATH
# CMAKE_FIND_ROOT_PATH_MODE_PROGRAM
# CMAKE_FIND_ROOT_PATH_MODE_LIBRARY
# CMAKE_FIND_ROOT_PATH_MODE_INCLUDE

# this one is important
set(CMAKE_SYSTEM_NAME Generic)

#this one not so much
set(CMAKE_SYSTEM_VERSION 1)

if(${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 3.5)
	# specify the cross compiler
	set(CMAKE_C_COMPILER arm-none-eabi-gcc)
	set(CMAKE_CXX_COMPILER arm-none-eabi-g++)

else()
	include(CMakeForceCompiler)

	# this one is important
	set(CMAKE_SYSTEM_NAME Generic)

	#this one not so much
	set(CMAKE_SYSTEM_VERSION 1)

	# specify the cross compiler
	find_program(C_COMPILER arm-none-eabi-gcc)
	if(NOT C_COMPILER)
		message(FATAL_ERROR "could not find arm-none-eabi-gcc compiler")
	endif()
	cmake_force_c_compiler(${C_COMPILER} GNU)

	find_program(CXX_COMPILER arm-none-eabi-g++)
	if(NOT CXX_COMPILER)
		message(FATAL_ERROR "could not find arm-none-eabi-g++ compiler")
	endif()
	cmake_force_cxx_compiler(${CXX_COMPILER} GNU)
endif()


# compiler tools
foreach(tool objcopy nm ld)
	string(TOUPPER ${tool} TOOL)
	find_program(${TOOL} arm-none-eabi-${tool})
	if(NOT ${TOOL})
		message(FATAL_ERROR "could not find ${tool}")
	endif()
endforeach()

# optional compiler tools
foreach(tool gdb gdbtui)
	string(TOUPPER ${tool} TOOL)
	find_program(${TOOL} arm-none-eabi-${tool})
	if(NOT ${TOOL})
		#message(STATUS "could not find ${tool}")
	endif()
endforeach()

set(LINKER_FLAGS "-Wl,-gc-sections")
set(CMAKE_EXE_LINKER_FLAGS ${LINKER_FLAGS})

# where is the target environment
set(CMAKE_FIND_ROOT_PATH  get_file_component(${C_COMPILER} PATH))

# search for programs in the build host directories
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)

# for libraries and headers in the target directories
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
